摘要：AbstractObjectiveTo investigate effects of different doses of atorvastatin on serum lipids, cardiomyocyte apoptosis and related genes in rats with myocardial infarction.Methods60 SD rats were randomized into control group (n = 12) and modeling group (n = 48). The models were established by ligation of left anterior descending (LAD) in rats. 5wk later, the rates after successful modeling were divided into modeling group (n = 12) and treatment group (n = 36), and treatment group was equally divided into low dose group (20 mg/kg atorvastatin daily), medium does group (40 mg/kg atorvastatin daily) and high does group (80 mg/kg atorvastatin daily). After administration, the ratio of heart weight (HW) to body weight (BW) was calculated (HW/BW). Contents of total cholesterol (TC), triglyceride (TG), low density lipoprotein cholesterol (LDL-C) and moderate – high density lipoprotein cholesterol (HDL-C) in serum of rats were measured. Apoptosis index of rat cardiomyocytes was detected with TUNEL method. Expression levels of Caspase-3, Bax, and Bcl-2 proteins in each group were detected by Western blot.ResultsCompared with control group, heart surface of modeling group was rough, and weight of model group was significantly higher than that of control group, low, medium and high dose groups after 9 weeks of modeling (P < 0.05). TC, TG, and LDL-C in modeling group were significantly higher than those in control group (P < 0.05), HDL-C was significantly lower than those in control group (P < 0.05). Changes in blood lipid-related indicators could be improved after administration, and the higher the dose, the better the improvement effect. Apoptosis index of cardiomyocytes in modeling group, the low, medium and high dose group was significantly higher than that in control group (P < 0.05), but apoptosis of cardiomyocytes was significantly reduced in atorvastatin group at different doses. The higher the dose, the more obvious the reduction effect. The expressions of Caspase-3, Bax, and Bcl-2 proteins in modeling group, low, medium and high dose groups were significantly higher than those in control group (P < 0.05), but administration group significantly reduced apoptosis of myocardial cells, and the higher the dose, the more significant the reduction effect.ConclusionAtorvastatin can reduce TC, TG and LDL-C levels and increase HDL-C level in blood lipids, inhibit expressions of Caspase-3 and Bax and raise expression of Bcl-2 protein so as to inhibit cardiac hypertrophy, reduce cardiomyocyte apoptosis, restore myocardial function and improve myocardial infarction symptoms.
关键词：Different doses of atorvastatin;Myocardial infarction;Myocardial apoptosis;Blood lipid-related indicators;Caspase-3 protein;Bax protein;Bcl-2 protein
